For tar-based and phar-based phar archives, this method decompresses the entire archive.

For Zip-based phar archives, this method fails with an exception.
The zlib extension must be enabled to decompress
an archive compressed with gzip compression, and the
bzip2 extension must be
enabled in order to decompress an archive compressed with bzip2 compression.
As with all functionality that modifies the contents of a phar, the
phar.readonly INI variable must be off
in order to succeed.

In addition, this method automatically changes the file extension of the archive,
.phar
by default for phar archives, or .phar.tar for tar-based phar archives.
Alternatively, a file extension may be specified with the second
parameter.

Parametri

extension

For decompressing, the default file extensions
are .phar and .phar.tar.
Use this parameter to specify another file extension. Be aware
that all executable phar archives must contain .phar
in their filename.